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qemu/int128: add int128_urshift

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Implement an unsigned right shift for Int128 values and add the same
tests cases of int128_rshift in the unit test.

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220330175932.6995-3-matheus.ferst@eldorado.org.br>
[danielhb: fixed long lines in test_urshift()]
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Matheus Ferst 2022-03-30 14:59:26 -03:00 • committed by Daniel Henrique Barboza
parent f290a23868
commit 613cf0fcba
2 changed files with 69 additions and 0 deletions
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19
include/qemu/int128.h
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@ -83,6 +83,11 @@ static inline Int128 int128_rshift(Int128 a, int n)
return a >> n;
}
static inline Int128 int128_urshift(Int128 a, int n)
{
return (__uint128_t)a >> n;
}
static inline Int128 int128_lshift(Int128 a, int n)
{
return a << n;
@ -299,6 +304,20 @@ static inline Int128 int128_rshift(Int128 a, int n)
}
}
static inline Int128 int128_urshift(Int128 a, int n)
{
uint64_t h = a.hi;
if (!n) {
return a;
}
h = h >> (n & 63);
if (n >= 64) {
return int128_make64(h);
} else {
return int128_make128((a.lo >> n) | ((uint64_t)a.hi << (64 - n)), h);
}
}
static inline Int128 int128_lshift(Int128 a, int n)
{
uint64_t l = a.lo << (n & 63);